The main challenge is whether Mr Nuttall's party will allow him to drive. He identified this issue a few months ago when Ukip was about to unveil its first successor to Mr Farage, Diane James. The new leader needed to be "their own person" and to "stamp their own mark", he declared. "Standing down must mean standing down," he added, in a thinly-veiled warning to Mr Farage and his followers. "The new leader will not benefit in any way, shape or form if any of us attempt to backseat drive." Mrs James tried to steer...